Scanning Near-Field Optical Microscopy of Ultrathin Gold Films
Ultrathin metal films are an essential platform for two-dimensional (2D) material compatible and flexible optoelectronics. Characterization of thin and ultrathin film-based devices requires a thorough consideration of the crystalline structure and local optical and electrical properties of the metal...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-04-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/13/8/1376 |
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| author | Dmitry I. Yakubovsky Dmitry V. Grudinin Georgy A. Ermolaev Andrey A. Vyshnevyy Mikhail S. Mironov Sergey M. Novikov Aleksey V. Arsenin Valentyn S. Volkov |
| author_facet | Dmitry I. Yakubovsky Dmitry V. Grudinin Georgy A. Ermolaev Andrey A. Vyshnevyy Mikhail S. Mironov Sergey M. Novikov Aleksey V. Arsenin Valentyn S. Volkov |
| author_sort | Dmitry I. Yakubovsky |
| collection | DOAJ |
| description | Ultrathin metal films are an essential platform for two-dimensional (2D) material compatible and flexible optoelectronics. Characterization of thin and ultrathin film-based devices requires a thorough consideration of the crystalline structure and local optical and electrical properties of the metal-2D material interface since they could be dramatically different from the bulk material. Recently, it was demonstrated that the growth of gold on the chemical vapor deposited monolayer MoS<sub>2</sub> leads to a continuous metal film that preserves plasmonic optical response and conductivity even at thicknesses below 10 nm. Here, we examined the optical response and morphology of ultrathin gold films deposited on exfoliated MoS<sub>2</sub> crystal flakes on the SiO<sub>2</sub>/Si substrate via scattering-type scanning near-field optical microscopy (s-SNOM). We demonstrate a direct relationship between the ability of thin film to support guided surface plasmon polaritons (SPP) and the s-SNOM signal intensity with a very high spatial resolution. Using this relationship, we observed the evolution of the structure of gold films grown on SiO<sub>2</sub> and MoS<sub>2</sub> with an increase in thickness. The continuous morphology and superior ability with respect to supporting SPPs of the ultrathin (≤10 nm) gold on MoS<sub>2</sub> is further confirmed with scanning electron microscopy and direct observation of SPP fringes via s-SNOM. Our results establish s-SNOM as a tool for testing plasmonic films and motivate further theoretical research on the impact of the interplay between the guided modes and the local optical properties on the s-SNOM signal. |
| first_indexed | 2024-03-11T04:40:31Z |
| format | Article |
| id | doaj.art-90adc89d6d2e4d10ad53d99054cf09cb |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-11T04:40:31Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-90adc89d6d2e4d10ad53d99054cf09cb2023-11-17T20:43:36ZengMDPI AGNanomaterials2079-49912023-04-01138137610.3390/nano13081376Scanning Near-Field Optical Microscopy of Ultrathin Gold FilmsDmitry I. Yakubovsky0Dmitry V. Grudinin1Georgy A. Ermolaev2Andrey A. Vyshnevyy3Mikhail S. Mironov4Sergey M. Novikov5Aleksey V. Arsenin6Valentyn S. Volkov7Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, RussiaCenter for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, RussiaCenter for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, RussiaCenter for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, RussiaCenter for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, RussiaCenter for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, RussiaCenter for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, RussiaCenter for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, Dolgoprudny 141700, RussiaUltrathin metal films are an essential platform for two-dimensional (2D) material compatible and flexible optoelectronics. Characterization of thin and ultrathin film-based devices requires a thorough consideration of the crystalline structure and local optical and electrical properties of the metal-2D material interface since they could be dramatically different from the bulk material. Recently, it was demonstrated that the growth of gold on the chemical vapor deposited monolayer MoS<sub>2</sub> leads to a continuous metal film that preserves plasmonic optical response and conductivity even at thicknesses below 10 nm. Here, we examined the optical response and morphology of ultrathin gold films deposited on exfoliated MoS<sub>2</sub> crystal flakes on the SiO<sub>2</sub>/Si substrate via scattering-type scanning near-field optical microscopy (s-SNOM). We demonstrate a direct relationship between the ability of thin film to support guided surface plasmon polaritons (SPP) and the s-SNOM signal intensity with a very high spatial resolution. Using this relationship, we observed the evolution of the structure of gold films grown on SiO<sub>2</sub> and MoS<sub>2</sub> with an increase in thickness. The continuous morphology and superior ability with respect to supporting SPPs of the ultrathin (≤10 nm) gold on MoS<sub>2</sub> is further confirmed with scanning electron microscopy and direct observation of SPP fringes via s-SNOM. Our results establish s-SNOM as a tool for testing plasmonic films and motivate further theoretical research on the impact of the interplay between the guided modes and the local optical properties on the s-SNOM signal.https://www.mdpi.com/2079-4991/13/8/1376ultrathin metal filmss-SNOMMoS<sub>2</sub>surface plasmon polaritonsdielectric constants |
| spellingShingle | Dmitry I. Yakubovsky Dmitry V. Grudinin Georgy A. Ermolaev Andrey A. Vyshnevyy Mikhail S. Mironov Sergey M. Novikov Aleksey V. Arsenin Valentyn S. Volkov Scanning Near-Field Optical Microscopy of Ultrathin Gold Films Nanomaterials ultrathin metal films s-SNOM MoS<sub>2</sub> surface plasmon polaritons dielectric constants |
| title | Scanning Near-Field Optical Microscopy of Ultrathin Gold Films |
| title_full | Scanning Near-Field Optical Microscopy of Ultrathin Gold Films |
| title_fullStr | Scanning Near-Field Optical Microscopy of Ultrathin Gold Films |
| title_full_unstemmed | Scanning Near-Field Optical Microscopy of Ultrathin Gold Films |
| title_short | Scanning Near-Field Optical Microscopy of Ultrathin Gold Films |
| title_sort | scanning near field optical microscopy of ultrathin gold films |
| topic | ultrathin metal films s-SNOM MoS<sub>2</sub> surface plasmon polaritons dielectric constants |
| url | https://www.mdpi.com/2079-4991/13/8/1376 |
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